Cho sơ đồ phản ứng sau:
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{X_1}\xrightarrow{{ + NaOH}}{X_2}\xrightarrow{{{\text{C}}{{\text{O}}_{\text{2}}}{\text{ + }}{{\text{H}}_{\text{2}}}{\text{O}}}}{X_3}\xrightarrow{{ + \,{H_2}S{O_4}}}{X_4}\xrightarrow{{ + dd\,N{H_3}}}{X_3}\xrightarrow{{{t^o}}}{X_5}\)
Biết X1, X2, X3, X4, X5 là các chất khác nhau của nguyên tố nhôm.
Các chất X1 và X5 lần lượt là
